CVE-2022-49077None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0) If an mremap() syscall with old_size=0 ends up in move_page_tables(), it will call invalid…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.3%
In the Linux kernel, the following vulnerability has been resolved:
mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0)
If an mremap() syscall with old_size=0 ends up in move_page_tables(), it will call invalidate_range_start()/invalidate_range_end() unnecessarily, i.e. with an empty range.
This causes a WARN in KVM's mmu_notifier. In the past, empty ranges have been diagnosed to be off-by-one bugs, hence the WARNing. Given the low (so far) number of unique reports, the benefits of detecting more buggy callers seem to outweigh the cost of having to fix cases such as this one, where userspace is doing something silly. In this particular case, an early return from move_page_tables() is enough to fix the issue.
Linux >= 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 < a05540f3903bd8295e8c4cd90dd3d416239a115bLinux >= 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 < eeaf28e2a0128147d687237e59d5407ee1b14693Linux >= 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 < e2c328c2a8f9de8b761bd4025b66c63120c55761Linux >= 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 < c19d8de4e682ec4b0ea2b04a832cd8cc0be3bb31Linux >= 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 < 7d659cb1763ff17d1c6ee082fa6feb4267c7a30bLinux >= 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 < a04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219Linux >= 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 < 2358aa84ef6dafcf544a557caaa6b91afb4a0bd2Linux >= 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 < 04bc13dae4a27b8d030843c85ae452bb2f1d9c1fLinux >= 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 < 01e67e04c28170c47700c2c226d732bbfedb1ad0Linux 3.2Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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